If you light <85kg, then the iS107 will be faster for sure. If your medium 85-95kg then the iS110 or if your 95kg> take the iS117.

All three boards have similar OFO tails and all will hit 35k. The iSonics have moved on a lot since your iS125, so you will probably gain a couple of knots straight out of the box. Also worth investing in a fast fin